2021 MERCEDES-BENZ GLS SUV fuel pressure

&
W
WARNI NG
ARNI NGRisk of accident due torepea-
te d pressure drop in the tyres
The wheels, valves or tyres could be damaged.
To o low a tyre pressure can lead tothe tyres
bursting. #
Examine the tyres forfo re ign objects. #
Check whe ther the tyre has a puncture
or theva lve has a leak. #
Ifyo u are unable torectify the damage,
contact a quali/ed specialist workshop. Information on
there commended tyre pressure
fo rth eve hicle's factor y-/tted tyres can be found
on the tyre pressure table on the inside of the fuel
/ller 0ap (/ page 402).
Use a suitable pressure gauge tocheck the tyre
pressure. The outer appearance of a tyre does not
permit any reliable conclusion about the tyre pres-
sure.
Only cor rect tyre pressures when the tyres are
cold. Conditions for cold tyres:
R The vehicle has been par ked with the tyres out
of direct sunlight for at least thre e hours. R
The vehicle has tr avelled less than 1.6 km.
The vehicle's tyres heat up when driving. As the
te mp erature of the tyres increases, so too does
th e tyre pressure.
V
V ehicles wit ehicles wit h a tyr
h a tyre pr
e pressur
essur e monit
e monit or
oring syst
ing syst em:
em:
yo u can also check the tyre pressure using the
on-board computer.
Not Not es on tr
es on tr ailer oper
ailer oper ation
ation
Alw ays in0ate there ar axle tyres tothere com-
mended tyre pressures on the tyre pressure table
fo r increased load. T
T
yr
yr e pr
e pr essur
essur e t
e table
able The tyre pressure
table is on the inside of the fuel
/ller 0ap. The tyre pressure
table sho ws there commended
tyre pressure for all tyres appr ovedfo rth is vehi-
cle. The recommended tyre pressures apply for
cold tyres under various operating conditions, i.e.
loading and/or speed of theve hicle.
If one or more tyre sizes precede a tyre pressure,
th efo llowing tyre pressure information is only
va lid forth ose tyre sizes and their respecti veload
condition. 402
402
Wheels and tyres

If
th e preceding tyre sizes are complemented by
th e+ symbol, the tyre pressure information
fo llowing sho wsalternative tyre pressures. Fuel
consum ption may then increase slightl y.
The load conditions "pa rtially laden" and "fully
laden" are de/ned in theta ble for di.erent num-
bers of passengers and amounts of luggage. The
actual number of seats may di.er from this. T
T
yr
yr e pr
e pr essur
essur e monit
e monit or
oring syst
ing syst em
em F
F
unction of t
unction of t he tyr
he tyre pr
e pressur
essur e monit
e monit or
oring syst
ing syst em
em
The system checks the tyre pressure and the tyre
te mp erature of the tyres /t tedtotheve hicle by
means of a tyre pressure sensor.
The tyre pressure and the tyre temp erature
appear in the on-board computer (/ page 403).
If th ere is a substantial pressure loss or if the tyre
te mp erature is excessive, you will be warned with
display messages (/ page 495) ortheh
wa rning lamp in the inst rument cluster
(/ page 517).
The tyre pressure monitoring system is only an
aid. It is the driver's responsibility toset the tyre pressure
tothere commended cold tyre pressure
suitable forth e operating situation.
In most cases, the tyre pressure monitoring sys-
te m will automatically update the new refere nce
va lues aTer you ha vechanged the tyre pressure.
Yo u can, ho wever, also update there fere nce val-
ues byrestarting the tyre pressure monitoring
system manually (/ page 404).
Syst
Syst em limits
em limits
The system may be impaired or may not function
particular lyin thefo llowing situations:
R incor rect refere nce values were ta ught in
R sudden pressure loss caused byafo re ign
object penetrating the tyre, forex ample
R there is a malfunction caused byano ther radio
signal source
Chec
Chec king t
king t he tyr
he tyr e pr
e pressur
essur e wit
e with t
h the tyr
he tyr e pr
e pressure
essure
monit
monit or
oring syst
ing syst em
em
R
R eq
equir uir ements:
ements:
R The vehicle is switched on. On-board computer:
4 Service 5
Tyres
One of thefo llowing displa ysappears:
R Current tyre pressure and tyre temp erature of
th e individual wheels: R
Tyre pressures will be displayed after a few
minutes of driving
R Tyre pressure monitor active: thete ach-in
process of the system is not yetcomple te. The
tyre pressures are already being monitored. #
Compare the tyre pressure with there com-
mended tyre pressure forth e cur rent ope rat-
ing condition (/ page 402).Additionall y, Wheels and tyres
403 403

W
W
ar
ar ning and indicat
ning and indicat or lam
or lamps
ps Ov
Ov
er
ervie
vie w of indicat
w of indicat or and w
or and war
arning lam
ning lam ps
ps Some systems will per
form a self-test when the
ve hicle is switched on. Some indicator and warn-
ing lamps may brie0y light up or 0ash. This beha v-
iour is non-critical. These indicator and warning
lamps indicate a malfunction only if they light up
or 0as haTer theve hicle has been star ted or dur-
ing a journe y.
Ins
Ins tr
trument displ ay
ument display Depending on
the display setting, the positions of
th e indicator lamps on the inst rument display may
di.er from theex ample shown. Indicat
Indicat
or and w
or and w ar
arning lam
ning lam ps:
ps:
6 Restraint system (/ page 505)
ü Seat belt (/ page 505)
ï Trailer hitch (/ page 506)
Ù Powe r steering (/ page 506)
ÿ Coolanttemp erature (/ page 508)
; Engine diagnostics (/ page 508)
p V
V ehicles wit
ehicles wit h a pe
h a petr
trol engine:
ol engine: engine
operating temp erature (/ page 508)
% V
Vehicles wit
ehicles wit h a diesel engine:
h a diesel engine: preglow
# Electricalfault (/ page 508)
8 Reser vefuel wi thfuel /ller 0ap loca-
tion indicator (/ page 508)
! Electric parking brake (red)
(/page 511)
! Electric parking brake (yellow)
(/page 511)
J Brakes (yellow) (/ page 511)
J Brakes (red) (/ page 511)
L Distancewarning (/ page 513) Ó
Active Brake Assist (/ page 513)
ê Active Brake Assist (/ page 513)
ä AIRMATIC / E- ACTIVE BODY CON-
TROL (/ page 513)
! ABS (/page 515)
÷ ESP®
(/ page 515)
å ESP®
OFF (/ page 515)
h Tyre pressure monitoring system
(/ page 517)
T Standing lights (/ page 160)
L Low beam (/ page 160)
K High beam (/ page 162)
#! Turn signal lights (/ page 162)
R Rear fog light (/ page 160) 504 504
Display message
s andwarning/indicator lamps

A
A
ctiv
ctiv eSt
e St eer
eer ing Assist
ing Assist
Ac tivating/deactivating.......................... 252
Ac tive Emer gency Stop Assist................ 253
Fu nction................................................ 251
System limits......................................... 251
A
A ctiv
ctiv e
eTr
Tra1c
a1c Jam Assist
Jam Assist
Ac tivating/deactivating.......................... 249
Fu nction................................................ 248
A A dap dap tiv
tive br
e br ak
ake lights
e lights .................................... 236
A
A dap
dap tiv
tive cr
e cr uise contr
uise contr ol
ol
see Active Distance Assist DISTRONIC
A
A dap
dap tiv
tive functions, MUL
e functions, MUL TIBEAM LED
TIBEAM LED
see Intelligent Light System
A
A dap
dap tiv
tive Highbeam Assis
e Highbeam Assist Plus t Plus
Fu nction................................................ 165
Switching on/o..................................... 166
A
A dBlue
dBlue ®
®
Ad ditives................................................ 429
Capacity................................................ 430
No tes..................................................... 219
Purit y.................................................... .429
To pping up............................................ .220 A
A dditional cushion dditional cushion
Leg rest................................................. 115
Re ar head restraint................................ 122
A
A dditional door lo ck
dditional door lock ....................................... 84
A
A dditiv
dditiv es
es
Ad Blue ®
................................................ .429
Engine oil............................................... 430
Fu el....................................................... 427
A
A dditiv
dditiv es (A
es (AdBlue
dBlue ®
®
)
)
see AdBlue ®
A
A dditiv
dditiv es (engine oil)
es (engine oil)
see Additives
A
A dditiv
dditiv es (fuel)
es (fuel)
see Fuel
ADS PL
ADS PL US dam
US dam ping syst
ping syst em
em
see AIRMATIC
ATer
ATer -sales
-sales ser
service
vice
see ASS YST PLUS
Air conditioning menu
Air conditioning menu Calling up.............................................. 179
Air dis
Air distr tribution
ibution
Setting................................................... 178
Setting (MBUX multimedia system)......... 180 Air fr
Air fr
eshener syst
eshener syst em
em
see Frag rance system
Air inlet
Air inlet see Air-water duct
Air pr
Air pr essure
essure
see Tyre pressure
Air suspension
Air suspension
see AIRMATIC
Air v
Air v ents
ents
Ad justing (front)..................................... 186
Ad justing (rear)...................................... 187
Glo vebox............................................... 188
Air v
Air v ents
ents
see Air vents
Air
Air -conditioning syst
-conditioning syst em
em
see Climate cont rol
Air
Air -r
-recir
ecir culation mode (wit
culation mode (wit h
h/ne
/ne
par
par ticle
ticle pr
pre/lt
e/lt er)
er).......................................... 181
Air
Air -w
-wat
ater duct
er duct
Ke eping free.......................................... 371
Airbag
Airbag
Activation................................................ 43
Cushionbag.............................................. 48 520
520
Index

5
Add 1 litre engine oil when next
re fuelling ............................................... 502
é ATTENTION ASSIST inoperati ve..... 471
é ATTENTION ASSIS T:Take a
break!.................................................... 471
: Automatic driving lights inoper-
ative...................................................... 448
_ Cannot fold 2nd seat row for-
wa rds See Owner's Manual .................... 460
Á Change key batteries .................... 446
J Check brake 0uid le vel.................. 470
ï Check trailer hitch lock (white
display message) .................................... 453
h Check tyre(s) ................................ 496
! Clean the fuel /lter....................... 463
Á Compressor is cooling .................. 486
ÿ Coolant Stop vehicle Switch
engine o............................................... 462
! currently una vailable See Own-
er's Manual............................................4 87÷
currently una vailable See Own-
er's Manual............................................4 88
5 Engine oil le vel cannot be meas-
ured....................................................... 503
5 Engine oil le velRe duce oil le vel..... 502
5 Engine oil le velSt op vehicle
Switch engine o.................................... 502
5 Engine oil pressure Stop Switch
o. engine.............................................. 503
ä Fault Drive at max. 80 km/h
...................................................... 483, 484
ä Fault Stop.................................... .484
6 Front leT malfunction Consult
wo rkshop (e xample)...............................4 43
& inoperative Battery low................. 451
& inoperative Refuel vehicle............. .451
& inoperative See Owner's Man........ 451
! inoperative See Owner's Manual.. .488
÷ inoperative See Owner's Manual.. .489
T inoperative See Owner's Manual.. .490 G
Inoperative................................... 491
î inoperative....................................4 75
: Intelligent Light System inopera-
tive........................................................ 449
Á Key being initialised Please wait.... 447
Á Key not de tected (red display
message).............................................. .447
Á Key not de tected (white display
message).............................................. .446
: LeT dipped beam (e xample).......... 448
6 LeT windowbag malfunction
Consult workshop (e xample).................. 443
 Lowe ring....................................... 485
: Malfunction See Owner's Man-
ual ......................................................... 448
î Max. speed 40 km/h .................... 476
ð Maximum speed exceeded ............ 475
î Not possible in cur rent drive
prog ram................................................. 475
Ø .................................................... 499 Index
527 527

ç
O................................................ .473
ë O.................................................4 71
ï Operation only possible in
transmission position P .......................... 452
! Parking brake See Owner's
Manual..................................................4 67
Á Please reduce speed .................... .486
Ý Please wait 48 V battery charg-
ing......................................................... 494
h Rectify tyre pressure ..................... 497
Ø Re/ll AdBlue See Owner ’sMan-
ual ......................................................... 499
! Release parking brake ...................469
¸ Replace air cleaner ....................... 463
Á Replace key.................................. 446
8 Reser vefuel le vel.......................... 463
6 Restraint sys. malfunction Con-
sult workshop ....................................... .443
# See Owner's Manual..................... 492
y Siderunning boa rdnot extended ... 455 Ù
Steering malfunction Increased
ph ysical e.ort See Owner's Manual....... 456
Ù Steering malfunction Stop
immediately See Owner's Manual ........... 456
# Stop vehicle Lea veengine run-
ning ....................................................... 494
# Stop vehicle See Owner's Man-
ual......................................................... 493
ç suspended .................................... 473
: Switch o. lights............................ 449
: Switch on headlamps .................... 449
á temp orarily una vailable Camera
view restric ted....................................... 482
¸ temp orarily una vailable Sensors
dirty....................................................... 481
Ø Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 499
+ Top up coolant See Owner ’s
Manual.................................................. 461
¥ Top up washer 0uid...................... .460 ï
Trailer coupling extending…........... 453
! Turn on the ignition torelease
th e parking brake ................................... 470
d Vehicle is operational Switch o.
ignition before exiting............................. 452
Á Vehicle rising Please wait.............. 485
Á Vehicle rising ................................ 485
h Warning tyre defect....................... 497
h Wheel sensor(s) missing ................ 496
Ø XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 500
Ac tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 479
Ac tive Blind Spot Assist inoperative........ 479
Ac tive Blind Spot Assist not available
when towing a trailer See Owner's
Manual................................................. .480
Ac tive Brake Assist Functions cur-
re ntly limi ted See Owner's Manual .........490 528 528
Index

W
W
W
W ar
ar ning lamp
ning lamp
see Warning/indicator lamp
W W ar ar ning syst
ning syst em
em
see ATA (anti-theT alarm system)
W
W ar
ar ning tr
ning tr iangle
iangle
Re moving............................................... 380
Setting up.............................................. 381
W
W ar
ar ning/indicat
ning/indicat or lamp
or lamp
! ABSwarning lamp......................... 515
Ó Active Brake Assist warning lam p..5 14
J Brake system warning lamp (red)... 512
J Brake system warning lamp (yel-
low)....................................................... 512
ÿ Coolant warning lamp (red)........... 508
ÿ Coolant warning lamp (yellow).......5 09
! Electric parking brake indicator
lamp (red).............................................. 511
# Electrical fault warning lam p......... 510
; Engine diagnosis warning lamp...... 510 p
Engine operating tempe rature
wa rning lamp......................................... 510
å ESP®
OFF warning lam p................ 516
÷ ESP®
wa rning lamp 0ashes........... 516
÷ ESP®
wa rning lamp lights up......... 516
8 Fuelreser vewarning lamp lights
up.......................................................... 511
Ù Powe r steering warning lamp
(red)...................................................... 506
6 Restraint system warning lam p...... 505
ü Seat belt warning lamp 0ashes...... 505
ü Seat belt warning lamp lights up.... 506
ä Suspension warning lamp (red)..... 514
ä Suspension warning lamp (yel-
low)....................................................... 514
! The electric parking brake (yel-
low) indicator lam p................................. 511
ï Trailer tow hitch warning lam p....... 507
h Tyre pressure monitoring sys-
te m wa rning lamp 0ashes....................... 517 h
Tyre pressure monitoring sys-
te m wa rning lamp lights up.................... 518
L Warning lamp for distance
wa rning function.................................... 513
Overview................................................ 504
PA SSENGER AIR BA G............................... 53
W
W arr arr anty
anty........................................................ 38
W
W ashing b
ashing b y hand (car
y hand (car e)
e)................................ 374
W
W at
at er t
er t ank
ank
see Air-water duct
W
W eat
eat her inf
her inf or
ormation
mation..................................... 334
W
W eb br ow
eb br owsers
sers
Overview................................................ 347
Wheel c
Wheel c hange
hange
Fi tting a new wheel................................ 413
Lo we ring theve hicle.............................. 414
Preparation............................................ 409
Ra ising theve hicle................................. 410
Re moving a wheel................................. .412
Re moving//tting hub caps..................... 409
Wheel c
Wheel c hange
hange
see Emer gency spa rewheel Index
553
553